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I like the untamed, no legendaries, novice tournament since I don't have a deep collection and all my good cards are level 1. In that tournament, the only cards you don't have are the untamed epics so I rent them all when I start the tournament. price for that changes quite a bit depending on how close we are to end of season

I only play the untamed novice no legendary tournmanets so I rent all the untamed epics and then no one has cards i don't have for the tournment